Hybrid Photopolymerization :: Chemistry

hybridisation photopolymerization has the potential for solving the gathering O inhibition and moisture problem that plagued the free-radical and cationic photopolymerization reactions respectively. The problem, however, with the hybrid system is the deprivation in the fundamental knowledge of the reaction in the system. This project tends to name and address these deficiencies by studying hybrid systems in order to understand how observational variables affect group O, moisture and alcohol sensitivity. This understanding go forth be archived by the following objectives Determine the kinetic crop constants for the hybrid systems.The kinetic rate constant, activation talent and Arrhenius constant of the hybrid systems impart be obtained from Raman spectroscopic analysis method. Model oxygen- spreading-effect in hybrid systems.An oxygen-diffusion-model leave behind be developed incorporating energy balance, specie balance and light attenuation parameters. Reduce oxygen diffusion in hybrid monomer films through formulation and processing variable selections. Hybrid monomer molecule and monomer mixture will be polymerized to obtain the conversion visibleness the cure sample will be investigated to obtain the functional group conversion versus depth by Raman spectroscopy and microscopy respectively. The physical properties of the resulting product will be checked in order to determine the least oxygen diffused product.Develop practical hybrid monomer formulations for industrial applications. Hybrid systems that laughingstock be replicated on the industrial scale will be formulated. These systems will be suggested based on availability, cost and resulting physical properties displayed as investigated in documentary three.IV.Research PlanAOverviewIn this study, a serial publication of hybrid systems will be considered monomers of these systems will have different functionality present, like those in Figure 5. Hybrid monomer molecule, that i s, a single monomer molecule with 2 moieties (such as acrylate and epoxide) and hybrid mixture formulation that will command separate molecules for each moiety (i.e. acrylate will be assorted with epoxide). The photoinitiator systems for this study will be expanded to include -cleavagable free-radical photoinitiator, such as dimethoxyphenylacetophenone (DMPA) shown in Figure 1, and cationic photoinitiator salts as shown in Figure 3. Raman spectroscopy will be used for in-situ investigation of polymerization of samples. Raman microscopy will be used to obtain profiles of functional group conversion at various depths. These methods are based upon a non-destructive Raman scattering technique which provides data about the vibrational and electronic states in a confined system.8 Cai,Ying 2006 The method is particularly well suited for detection of chemical bonds and their changes during reaction.B.Objective 1 Kinetic Study of the Hybrid Systems